Wood's lamp
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A device called a Wood's lamp is a diagnostic tool used in dermatology that involves shining ultraviolet light (at a wavelength of approximately 365 nanometers) from a "black light" source onto the skin of the patient, and observing any subsequent fluorescence. For example, porphyrins will fluoresce pink. Though the technique for producing a source of UV light was devised by Robert Williams Wood in 1903 using "Wood's glass", it wasn't until 1925 that the technique was first used in dermatology by Margarot and Deveze for the detection of fungal infection of hair.
Wood's light is useful in diagnosing conditions such as tuberous sclerosis and Erythrasma, both in distinguishing them from other conditions, and also in locating the precise boundaries of the condition. It is also helpful in diagnosing Fungal infections (Microsporum audouini), Bacterial infections (Corynebacteriium minutissimum, Pseudomonas), and Pigmentary disorders.
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External links
| L i g h t i n g and L a m p s | ||
|---|---|---|
| Incandescent: | Incandescent light bulb>Conventional - Halogen - Parabolic Aluminized Reflector (PAR) |
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| Fluorescent: | Compact fluorescent lamp>Compact Fluorescent (CFL) - Linear fluorescent - Induction lamp | |
| Gas discharge: | High-intensity discharge lamp>High-Intensity Discharge (HID) - Mercury-vapor - Metal-halide - Neon - Sodium vapor | |
| Electric arc: | Arc lamp - Hydrargyrum medium-arc iodide>HMI - Xenon arc - Yablochkov candle | |
| Combustion: | Carbide lamp>Acetylene/Carbide - Candle - Gas lighting - Kerosene lamp - Limelight - Oil lamp - Safety lamp | |
| Other types: | Sulfur lamp - Light-emitting diode>Light-Emitting Diode (LED) - Optical fiber - Plasma | |
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